Final answer:
Legal requirements for towing a person behind a boat often include having an observer in addition to the driver to ensure the safety of the person being towed.
Step-by-step explanation:
The question is inquiring about the legal requirements for towing a person behind a boat, specifically whether an observer, in addition to the driver, is needed. In most situations, laws and regulations about boating safety require not only a competent driver but also an additional observer or spotter who keeps an eye on the person being towed.
This observer is crucial because the driver's attention will be primarily on navigating the boat, and an additional set of eyes ensures the immediate response should anything go awry with the person being towed. The observer's role is to signal the driver if the towed person falls into the water or if there is any other concern that requires immediate attention.